威信凹陷龙马溪组页岩成藏条件分析

发布时间：2018-06-08 08:01

本文选题：威信凹陷 + 页岩气　；参考：《地质科技情报》2017年03期

【摘要】：下志留统龙马溪组是威信凹陷页岩气重点勘探评价层系之一。以威信凹陷下志留统龙马溪组为研究对象,通过5口井的孔渗、比表面、X衍射矿物分析、有机质含量、镜质体反射率、三轴应力实验和常规测井以及ECS测井数据分析了该页岩储层的地球化学特征、储存能力、矿物成分以及储层力学特性。结果表明:与北美及四川礁石坝页岩比较,该页岩储层有机质丰度一般,成熟度高,地球化学特征有利于大量生烃;吸附性较好,孔渗性较低,表现出较好的存储特性和较差的物性;脆性矿物含量适中,杨氏模量适中,但泊松比较小,储层表现出较好的脆性;在纵向上,龙马溪组下部泥岩层具有较大的w(TOC)值与较好的孔渗特性,且脆性矿物含量普遍高于上部,较上部表现出更好的开发潜力。
[Abstract]:Longmaxi formation of Lower Silurian is one of the important strata for shale gas exploration and evaluation in Weixin sag. Taking Longmaxi formation of Lower Silurian in Weixin depression as the research object, through the porosity and permeability of 5 wells, X ray diffraction mineral analysis of specific surface, organic matter content, vitrinite reflectance, etc. The geochemical characteristics, storage capacity, mineral composition and mechanical properties of the shale reservoir are analyzed by triaxial stress test, conventional logging and ECS logging data. The results show that compared with the rocks shale of North America and Sichuan, the shale reservoir has the advantages of general abundance of organic matter, high maturity, favorable geochemical characteristics for hydrocarbon generation, good adsorption and low porosity and permeability. It shows better storage characteristics and poor physical properties, moderate content of brittle minerals, moderate Young's modulus, but relatively small Poisson, and better brittleness of reservoir; longitudinally, The lower mudstone layer of Longmaxi formation has a larger wantone value and better porosity and permeability characteristics, and the content of brittle minerals is generally higher than that of the upper part, which shows better exploitation potential than that of the upper part.
【作者单位】：中国地质大学(北京)能源学院;中国石油集团测井有限公司技术中心;
【基金】：中国石油股份公司重大科技专项“深层高温高压测井岩石物理与成像评价技术研究”(2014E-3205)
【分类号】：P618.13

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